Philatelic Collectible First Day Cover, limited edition, postmarked 16 October 1976. The First Corps of Cadets, presently the 211th Military Police Battalion, was originally organized in 1726 though the unit wasn’t officially chartered until 15 years later on 16 October 1741. This First Day Cover, postmarked at the provisional Veteran Association Station Post Office in Boston, commemorates the 250th anniversary of the unit’s history (1726-1976) and was commissioned by the Veteran Association of the First Corps of Cadets to coincide with the United States Bicentennial.